Si died May 9, 2004. He was 90.
A graduate of Trenton [N.J.] Senior High School, he majored in politics at Princeton and played on the freshman and varsity basketball teams. In 1939 he graduated from Harvard Law School. During World War II he served in the Coast Guard.
He began his New Jersey political career in 1947 after being elected Mercer County Sheriff. In 1951 he was elected Trenton City Commissioner, and he served in the New Jersey State Senate from 1952-72. There he was president, and majority and minority leader. In 1967, as senate president, he served as acting governor twice.
In addition to his political career, he also had a distinguished legal practice and was president of the Mercer County Bar Association.
Over the years, Si found time to serve on the boards of organizations dealing with human relations, health, and banking; on the Trenton City Board of School Estimates; and the Trenton Police and Fire Commission. He also was a member of Princeton's Schools and Scholarship Committee.
Si's wife, Beatrice, predeceased him July 14, 2000. He is survived by his children Robert N. '70, Jane, and Susan, and three grandchildren.
The Class of 1936